Defrost seafood in a sieve. Carve tomato crosswise, blanch with boiling water, let stand briefly. Quench tomato, peel skin. Cut tomato into slices and remove seeds.
Chop the flesh. Peel onion and garlic and chop finely. Clean and wash the bell peppers and cut them into finger-thick strips. Wash and dry all the flesh. Cut pork fillet into cubes.
Season chicken legs with salt and pepper. Heat 3 tablespoons of oil in a frying pan. Fry the chicken legs for 4-5 minutes, turning them until brown, then remove them. Add pork to the hot frying fat and fry for 3-4 minutes all around,
Add seafood to the hot frying fat and sauté over medium heat for 2-3 minutes, remove. Add tomatoes, beans, peppers, onion and garlic to the hot pan. Fry for 3-4 minutes while stirring occasionally.
In a paella pan (approx. 30 cm bottom/ 35 cm Ø top, approx. 5 cm high) or in the fat pan of the oven, mix rice, 1 teaspoon salt, saffron, tomato vegetables and peas. Pour over approx. 1 1/4 litre of boiling water and bring to the boil.
Season with salt again if necessary. Spread the whole meat and seafood on the rice. Bake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) on the lower shelf for 25-30 minutes (do not stir) until the rice is cooked and the liquid is absorbed.
Remove the paella from the oven, cover with a tea towel and leave to rest for 7-8 minutes, garnish with parsley if necessary and serve.